The unresponsive lockscreen is a common problem, and hasn't been fixed by an update. That said, when I had the phone, it was a minor annoyance, not something that would have caused me to ditch the phone. Basically it just meant it was harder to start the device from the lockscreen.

Other than that, I never had any antenae issues and, in general, the software worked seamlessly. It's a truly wonderful phone and I highly recommend it!